/Engine/Source/Runtime/ApplicationCore/Public/GenericPlatform/ITextInputMethodSystem.h
Registers an implemented context interface object with the system to receive callbacks and provides an implemented notifier interface object. Editable text should call this method after constructing an implemented context interface object.
An implemented notifier interface object
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [ITextInputMethodChangeNotifier](API\Runtime\ApplicationCore\GenericPlatform\ITextInputMethodChangeNotifier) > RegisterContext ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [ITextInputMethodContext](API\Runtime\ApplicationCore\GenericPlatform\ITextInputMethodContext) > & Context )